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  1. #1

    R-Value/Temperature Rating Comparison

    I was struggling to compare pads, what with R-values and temperature ratings.
    Luckily the Exped site puts both on the specs of their pads, so I made a chart.
    Thought I would put it up here just in case anyone else might find it useful.

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  2. #2
    Senior Member
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    Thank you. Was just looking into this today!

  3. #3
    SilvrSurfr's Avatar
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    Just keep in mind that R-value is for when the pad is used on the ground. To my knowledge, those ratings don't apply when you're suspended in the air.
    "A foolish consistency is the hobgoblin of little minds." Ralph Waldo Emerson

  4. #4
    Senior Member Drybones's Avatar
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    Quote Originally Posted by SilvrSurfr View Post
    Just keep in mind that R-value is for when the pad is used on the ground. To my knowledge, those ratings don't apply when you're suspended in the air.
    Or in a shelter, I've slept comfortable in a tent at 15* on a 3.5 R pad wearing only boxers...froze my butt off in a shelter at about 25* with the same gear and a down jacket on...got cold from the bottom.

  5. #5
    all secure in sector 7 Shug's Avatar
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    Thanks for this.....good to have on record. Got a couple pads for my Amok and now I know I can get on down there.
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    Whooooo Buddy)))) All Secure in Sector Seven

  6. #6
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    Quote Originally Posted by SilvrSurfr View Post
    Just keep in mind that R-value is for when the pad is used on the ground. To my knowledge, those ratings don't apply when you're suspended in the air.
    R-value is r-value. Suspended or on the ground. But I agree that the temperature ratings for a pad on the ground aren't valid for hammock use.

  7. #7
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    I agree. R value is a measure of a materials ability to restrict heat flow. On the ground, you fight conduction. In the hammock or on a raised shelter platform with air gaps you fight conduction and convection heat loss.

  8. #8
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    ... and maybe more than a smidgen of radiative.

    All this raises an interesting question when it comes to temperature rating of a pad because it seems that the manufacturers are taking into account air temp and not ground temp, but I could be making a gross assumption. Regardless, I suspect the average reader of that chart is thinking air temp.

    Ask a ground sleeper about sleeping on frozen ground with air temp in the 50s.

  9. #9
    Senior Member millergear's Avatar
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    Some data I gleaned from Dave Womble (and/or Ed Speer) many years back specifically for in a hammock. My tests showed them to be right on. BUT, everyone is different! And not all Pads have them same R Value per inch.

    Pad Thickness R-value Temperature
    (in.) (deg. F)
    0 0.00 70
    1/8 0.54 63
    1/4 1.09 57
    3/8 1.63 50
    1/2 2.17 43
    5/8 2.71 37
    3/4 3.26 30
    7/8 3.80 23
    1 4.34 17
    I'm much to young to feel this Dang old!

  10. #10
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    That's just it. Temperature rating for whom?

    And r-value per inch variability has probably mushroomed with all of the pad options these days.

    Still, something that one can use as a starting point for reference could be useful...

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